ALV_grid oo: event "data_changed" on F4 in the line only for some fields

Hi all,

when I add a new line in ALV_Grid and I select the search help, for some fields

the event "data_changed" has triggered even I have not finished to fill the entire fields on the line, and I don't need this.

Opposite I have some fields which work fine and when I choose F4 the list of the

possible values has showed without triggering "data_changed".

Does anyboby know how is it possible?

Since I'm new on ALV_grid oo, could you give a detailed answer?

I thank You in advance.

Best Regards

Paolo